Ozeki, K. Kako, E. Kamigaito, O. Nakai, H. Okihira, K. Okuno, H. Sakamoto, N. Sennyu, K. Suda, K. Umemori, K. Watanabe, Y. Yamada, K. Yanagisawa, T. JACoW Geneva, Switzerland 978-3-95450-178-6 10.18429/JACoW-SRF2015-THPB084 English 1335-1339 THPB084 cavity radiation cryomodule Windows ion Contribution to a conference proceedings 2015 2015-12 http://dx.doi.org/10.18429/JACoW-SRF2015-THPB084 http://srf2015.vrws.de/papers/thpb084.pdf In RIKEN Nishina Center, for the purpose of development of elemental technology for the superconducting linear accelerator, the designing and construction of accelerator system based on superconducting quarter-wavelength resonator are carried out. The basic designs of the input coupler are as follows: The resonance frequency of the cavity is 75.5 MHz and assumed beam loading is about 1 kW. Double vacuum windows, which are disk-type, are adopted. A thermal anchor of 40 K is installed near the cold-window. The optimum positions of the cold-window and the thermal anchor depending on the effective RRR of copper-plate are being studied. In this contribution, the details of these designs will be reported. This work was funded by ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan).